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  <title>Get an ImagickPixelIterator for an image section</title>
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  <div id="layout-content"><div id="imagick.getpixelregioniterator" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Imagick::getPixelRegionIterator</h1>
  <p class="verinfo">(PECL imagick 2, PECL imagick 3)</p><p class="refpurpose"><span class="refname">Imagick::getPixelRegionIterator</span> &mdash; <span class="dc-title">Get an ImagickPixelIterator for an image section</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-imagick.getpixelregioniterator-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Imagick::getPixelRegionIterator</strong></span>(<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">int</span> <code class="parameter">$x</code></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">int</span> <code class="parameter">$y</code></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">int</span> <code class="parameter">$columns</code></span>,<br>&nbsp;&nbsp;&nbsp;&nbsp;<span class="methodparam"><span class="type">int</span> <code class="parameter">$rows</code></span><br>): <span class="type"><a href="class.imagickpixeliterator.html" class="type ImagickPixelIterator">ImagickPixelIterator</a></span></div>

  <p class="para rdfs-comment">
   Get an ImagickPixelIterator for an image section.
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-imagick.getpixelregioniterator-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">x</code></dt>

     <dd>

      <p class="para">
       The x-coordinate of the region.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">y</code></dt>

     <dd>

      <p class="para">
       The y-coordinate of the region.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">columns</code></dt>

     <dd>

      <p class="para">
       The width of the region.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">rows</code></dt>

     <dd>

      <p class="para">
       The height of the region.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-imagick.getpixelregioniterator-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns an ImagickPixelIterator for an image section.
  </p>
 </div>

 
 <div class="refsect1 errors" id="refsect1-imagick.getpixelregioniterator-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   错误时抛出 ImagickException。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-imagick.getpixelregioniterator-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2784">
    <p><strong>示例 #1 <span class="methodname"><strong>Imagick::getPixelRegionIterator()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     Iterate over the pixels in the top left of the image, changing them to be black.
    </p></div>
    <div class="example-contents">
     <div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$im&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">(</span><span style="color: #0000BB">realpath</span><span style="color: #007700">(</span><span style="color: #DD0000">"./testImage.png"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">$areaIterator&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$im</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getPixelRegionIterator</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br />foreach&nbsp;(</span><span style="color: #0000BB">$areaIterator&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$rowIterator</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;foreach&nbsp;(</span><span style="color: #0000BB">$rowIterator&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$pixel</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;Paint&nbsp;every&nbsp;pixel&nbsp;black<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$pixel</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setColor</span><span style="color: #007700">(</span><span style="color: #DD0000">"rgba(0,&nbsp;0,&nbsp;0,&nbsp;0)"</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$areaIterator</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">syncIterator</span><span style="color: #007700">();<br />}<br /></span><span style="color: #0000BB">$im</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">writeImage</span><span style="color: #007700">(</span><span style="color: #DD0000">"./output.png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 
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